Gardner Bender GVD-3504 Circuit Alert Non-Contact Voltage Tester, Indicates AC Voltage 50-600V, Patented, CUL, ETL Listed N/A Imported Use this tester to check for "hot" wires before you begin electrical work Beeps and flashes to indicate the presence of AC voltage from 50V to 600V Fully insulated probe tip eliminates the risk of contacting live electrical wires Built in safe test indicates tester and batteries are working properly Compact design with pocket clip for portability